At the Stanford two‐mile accelerator a 1.02‐meter hydrogen bubble chamber recently began running. The third largest in the US, it is probably the last of its generation to be built, according to Joseph Ballam, who directs the SLAC research division. Most of the big high‐energy laboratories now want larger, room‐size chambers. A 4‐meter chamber is being built at Argonne, and a 4.3‐meter chamber for Brookhaven was recently recommended by the Weisskopf high‐energy physics committee.

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